It is certainly possible but CPVRTModelPOD isn’t designed to be modified dynamically so it would involve reallocating/copying the various lists (e.g. node, material, meshes) and updating the stored IDs/sizes. Long story short, this wouldn’t be the best approach for what you wish to do.
Maybe consider having everything static in one POD file and all the dynamic objects in their own PODs. Then modify your rendering code to render a dynamic list of CPVRTModelPODs.